Carburetor



July 1, 1930. w. B. BARNES 1,769,098

GARBURETOR Filed June 2, 1927 Patented July 1, 1930 UNITED STATES PATENT OFFICE WILLIAM B. BARNES, OF AUBURN, INDIANA, ASSIGNOR TO INTERNATIONAL HAR- VESTEIR- COMPANY, A CORPORATION OF NEW JERSEY CARBURETOR Application filed an. 2, 1927. Serial no. 195,911.

This invention relates to carburetors, and more particularly to improvements, whereby .the proper proportions of fuel and 'air may be supplied as an explosive mixture to the engine under the various operating conditions of the engine.

It is an object of the invention to provid a carburetor having improved automatically acting means for supplying a desirable increment of fuel to the mixture when the throttle for the carburetor is suddenly opened to a greater extent, the same means acting under continued running of the-engine to provide a desirable increment to the .proportion of air in the explosive mixture under other operative conditions of the carburetor and the engine.

It is a further object of the invention to provide a single element which, when inserted in a known carburetor, will replace a plurality of elements, accomplishing the same and additional results as compared to the results accomplished by the plurality of' elements.

In this application the invention is shown embodied in a vortex type of carburetor.

. In the drawings,-

Figure 1 is a vertical sectional view through a complete carburetor showing an embodiment of the invention; and.

Figure 2 is partly a side elevation and partly a vertical section illustrating the carburetor as applied to an engine.

The carburetor body illustrated 'in the drawings comprises a mixing chamber 1' preferably in the form of a volute having a lateral and substantially tangential air intake 2. The mixture outlet of the carburetor is illustrated at 3. In this outlet there is located a throttle 4.

The fuel is contained in a float chamber 5 referably located above the mixing chamer. The float chamber cover 6 preferably has integral therewith a hollow, cylindrical housing 7, which encloses the nozzle or jet device of the carburetor and forms a nozzle chamber or suction chamber. This housing extends downward to the bottom of the float chamber and is secured thereagainst by reason of its screw-threaded contact with a central body 8 extending (upwardly through the bottom of the float chamber and affording passages or conduits 9 and 10, through which fuel passes downwardly to the mixing chamber. These conduits may be termed the nozzle.

The fuel is kept at a substantially constant includes the valve operating lever 12, the

valve pin 13, the valve needle 14, and the housing parts 15 and .16. Beneath the valve mechanism is located a chain valve 17. Fuel flows from the float chamber to the nozzle through a passage 18 in the wall of the housing 7. When the carburetor is inoperative, the fuel seeks a level near the top of the passage 9. When the engine is started, suction of the engine is transmitted through the passages 9 and 10 to cause the fuel level within the casing 7 to rise and the fuel to flow down those passages to the vortex mixing chamber 1. Y i

The amount of fuel flowing from the float chamber into the nozzle chamber is regulated by means ofa plug 19 which is preferably screw-threaded into the housing 7, as shown. The lower end of this plug fits tightly against the interior walls of the housing 7 and extends to such a position that it may project to a greater or-less' extent across the passage 18.

' The plug 19 not only regulates the passage operating conditions. More specifically, the

plug 19 provides an accelerating well containing a reserve supply of fuel for use when the throttle is suddenly opened, and it also provides a fuel sealed auxiliary air'passage for increasing the proportion of air in the explosive mixture when the engine is running at capacity, or at high engine speeds. In the embodiment shown, the plug 19 is provided with a passage 20 communicating with a Pitot tube21, which leads to "the air inlet 2 of the carburetor. The passage 20 communicates at its other end with the accelerating well 22. The inner wall 23 of this 'acelerating well is an integral part of the plug 19 and is provided with a plurality of passages 24, 25 and 26 leading to the nozzle chamber.

Assuming that the engine to which the carburetor is connected is at rest, and assuming that the fuel level in the accelerating well is the same as the fuel level in the float chamber and the nozzle chamber, a sud den opening of the throttle 4 and a sudden starting of the engine causes a demand for a rich fuel mixture. The increased suction under these conditions exhausts the supply of fuel in the nozzle chamber and also causes- 22 and the nozzle 10. These passages become unsealed in succession. In Figure 1 of the drawings, three of the passages are shown as being sealed by the fuel, but, as the above mentioned action takes place, the second, third and fourth passa es from the top become successively unsea ed so as to admit increasing amounts of air to the nozzle chamber.

When the engine and the carburetor assume normal running conditions, a supply of fuel will be maintained in the accelerating well 22, this supply being held in readiness for any emergency demands placed upon the carburetor by the sudden opening of the throttle 4:.

Asv shown in the drawings, the plug 19 extends through a passage 27 which connects the Pitot tube 21 with the top of the float chamber, communication between the passage 27 and the top of the float chamber being" afforded through a passage 28. The top of the plug 19 is preferably knurled so as to be held in its adjusted position by means of a spring 29.

In Figure 2, the illustrative carburetor is shown as connected to an engine having the intake manifold 30, engine block 31, the head 32, the piston 33, and the connecting rod 34.

While the invention has been described with reference to a specific structure, it is to be understood that the use of the invention is not limited thereto, but that it is capable of use in'various combinations and subcombinations within the scope of the appended claims.

What is claimed as new is:

1. A carburetor comprising, in combination, a mixing chamber, a fuel supply chamber, an air intake communicating with the mixing chamber, a fuel nozzle connected with thegnixin'g chamber and the fuel cham ber, a housing enclosing the nozzle and forming a nozzle chamber, a single element insertable in the cover and the housing and cooperating with the latter to form an accelerating well, and means affording a passage communicating with the air intake and the element, said element having a bore establishing communication between the accelerating well and the passage, said element and accelerating well extending into the nozzle chamber below the top of the nozzle and being there provided with a series of vertically spaced ports permitting increasing passage of air to the nozzle as the fuel in the accelerating well is exhausted.

2. A carburetor comprising, in combination, a mixing chamber, a fuel supply chamber, an air intake communicating with the mixing chamber, a fuel nozzle connected with the mixing chamber and the fuel chamber, a housing, a downwardly extending cylindrical member having a hollow lower portion enclosing the nozlze and forming an acceleratin well with the Wall of the housing, means afiording a passage affording direct fuel communication from the supply chamber,beneath said member and accelerating Well to the nozzle and the mixing chamber, and means for vertically adjusting said member to increase or decrease the maximum flow of fuel through the passage.

3. A carburetor comprising, in combina: tion, a mixing chamber, a fuel supply chamber located above the mixing chamber, an air intake communicating with the mixing chamber, an upstanding fuel nozzle connected with the mixing chamber and the fuel chamber and located within the fuel supply chamber, a cover'for the supply chamber, a cylindrical housing integral with the cover and enclosing the nozzle and forming a nozzle chamber, a vertically ad'ustable downwardly extending hollow cyhndrical member enclosing the nozzle and forming an accelerating well with the inner wall of the housing, and means affording a fuel passage independent of the accelerating well and giving direct communication beneath said member from the fuel supply chamber to the ment insertable in the housing and the nozzle chamber as a separate unit so as to form with the outer wall of the nozzle chamber an accelerating well terminating above the bottom of the nozzle chamber and a progressively unsealed air bleed, means affording a passage for fuel from the supply chamber beneath the accelerating well to the nozzle, and means for vertically adjusting'the element to restrict said passage.

1 5. A carburetor comprising, in combination, a mixing chamber, a fuel supply chamber, an air intake communicating with the mixing chamber, a fuel nozzle connected with the mixing chamber and the fuel chamber, a housing enclosing the nozzle and forming a nozzle chamber extending to the bottom of the fuel chamber, a single element insertable in the cover and the housing and forming with the inner wall of the latter an accelerating well, and mean-s affording a passage communicating around the fuel supply chamber with the air intake and the element, said element having a bore establishing communication between the accelerating well and the passage, said element and accelerating well extending into the nozzle chamber below the top of the nozzle and being there provided with a series of vertically spaced ports permitting increasing passage of air to the nozzle as the fuel in the accelerating well is exhausted.

In testimony whereof I aflix my signature. WM. B. BARNES. 

